$2,249 440 Source Stroker kit gives you modern components. Full radius crank, H beam rods and lightweight pistons. This was very expensive full race stuff years ago. And it comes balanced with rod and main bearings and freight to your doorstep. To me stock internals are for the dumpster. You will have more power than ever dreamed of. I would use the 512. It's a good time to be building an engine.